Question 1202538
.
Ella's computer monitor has a 20-inch screen, which means that the length of the diagonal 
of the screen is 20 inches. There is a 1-inch margin along the four sides of the screen.
The monitor can be laid flat so that it just fits into a box that is 11 inches wide. 
How long is the box?
~~~~~~~~~~~~~~~~~~~~~~~~


<pre>
From the problem, we conclude that one of the two dimensions of the screen is 

      11 - 1 - 1 = 9 inches.


Hence,  applying the Pythagoras, we find that the other dimension of the screen is  {{{sqrt(20^2 - 9^2)}}} = {{{sqrt(319)}}} = 17.86 inches (rounded).


It tells us that the corresponding dimension of the box is 17.86 + 1 + 1 = 19.86 inches.


Since this dimension is greater than 11 inches, we have every reason to call this dimension
as "the length of the box".


<U>ANSWER</U>.  The length of the box is 19.86 inches.
</pre>

Solved.